This study focused on the gender differences in the impact of a premarital educational program as an elective course at a university. Six hundred university students who were enrolled in the course "Family and Marriage" at a university in Pusan were surveyed for this study The students completed the survey questionnaire about attitudes toward marriage, family, love, spouse, sexuality and gender-roles, before and after the course. The data were analyzed by correlation, 1-test, two-Way ANOVA. The results showed, first of all, there was no significant impact of the education on the students′ attitudes on marriage and family, when gender was not introduced as a factor. However, looking closely, there was an interaction between gender and the attitudes in the impact of the education. As a result, the gender gap in terms of the attitudes toward marriage and the family that existed before the course was reduced after the course. Also, there were gender differences in the attitudes toward love, spouse, sexuality, and gender-roles before and after the course, and there were significant impacts of the course for both genders, albeit in different directions.